1 /* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */
4 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
34 * tmpfs vnode interface.
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
39 #include <sys/param.h>
40 #include <sys/fcntl.h>
41 #include <sys/lockf.h>
43 #include <sys/namei.h>
46 #include <sys/rwlock.h>
47 #include <sys/sched.h>
49 #include <sys/systm.h>
50 #include <sys/sysctl.h>
51 #include <sys/unistd.h>
52 #include <sys/vnode.h>
55 #include <vm/vm_param.h>
56 #include <vm/vm_object.h>
57 #include <vm/vm_page.h>
58 #include <vm/vm_pager.h>
60 #include <fs/tmpfs/tmpfs_vnops.h>
61 #include <fs/tmpfs/tmpfs.h>
63 SYSCTL_DECL(_vfs_tmpfs);
65 static volatile int tmpfs_rename_restarts;
66 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD,
67 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0,
68 "Times rename had to restart due to lock contention");
71 tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags,
75 return (tmpfs_alloc_vp(mp, arg, lkflags, rvp));
79 tmpfs_lookup(struct vop_cachedlookup_args *v)
81 struct vnode *dvp = v->a_dvp;
82 struct vnode **vpp = v->a_vpp;
83 struct componentname *cnp = v->a_cnp;
84 struct tmpfs_dirent *de;
85 struct tmpfs_node *dnode;
88 dnode = VP_TO_TMPFS_DIR(dvp);
91 /* Check accessibility of requested node as a first step. */
92 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
96 /* We cannot be requesting the parent directory of the root node. */
97 MPASS(IMPLIES(dnode->tn_type == VDIR &&
98 dnode->tn_dir.tn_parent == dnode,
99 !(cnp->cn_flags & ISDOTDOT)));
101 TMPFS_ASSERT_LOCKED(dnode);
102 if (dnode->tn_dir.tn_parent == NULL) {
106 if (cnp->cn_flags & ISDOTDOT) {
107 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc,
108 dnode->tn_dir.tn_parent, cnp->cn_lkflags, vpp);
111 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
116 de = tmpfs_dir_lookup(dnode, NULL, cnp);
117 if (de != NULL && de->td_node == NULL)
118 cnp->cn_flags |= ISWHITEOUT;
119 if (de == NULL || de->td_node == NULL) {
120 /* The entry was not found in the directory.
121 * This is OK if we are creating or renaming an
122 * entry and are working on the last component of
124 if ((cnp->cn_flags & ISLASTCN) &&
125 (cnp->cn_nameiop == CREATE || \
126 cnp->cn_nameiop == RENAME ||
127 (cnp->cn_nameiop == DELETE &&
128 cnp->cn_flags & DOWHITEOUT &&
129 cnp->cn_flags & ISWHITEOUT))) {
130 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
135 /* Keep the component name in the buffer for
137 cnp->cn_flags |= SAVENAME;
143 struct tmpfs_node *tnode;
145 /* The entry was found, so get its associated
149 /* If we are not at the last path component and
150 * found a non-directory or non-link entry (which
151 * may itself be pointing to a directory), raise
153 if ((tnode->tn_type != VDIR &&
154 tnode->tn_type != VLNK) &&
155 !(cnp->cn_flags & ISLASTCN)) {
160 /* If we are deleting or renaming the entry, keep
161 * track of its tmpfs_dirent so that it can be
162 * easily deleted later. */
163 if ((cnp->cn_flags & ISLASTCN) &&
164 (cnp->cn_nameiop == DELETE ||
165 cnp->cn_nameiop == RENAME)) {
166 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
171 /* Allocate a new vnode on the matching entry. */
172 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
173 cnp->cn_lkflags, vpp);
177 if ((dnode->tn_mode & S_ISTXT) &&
178 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) &&
179 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) {
185 cnp->cn_flags |= SAVENAME;
187 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
188 cnp->cn_lkflags, vpp);
195 /* Store the result of this lookup in the cache. Avoid this if the
196 * request was for creation, as it does not improve timings on
198 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE)
199 cache_enter(dvp, *vpp, cnp);
202 /* If there were no errors, *vpp cannot be null and it must be
204 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp)));
210 tmpfs_create(struct vop_create_args *v)
212 struct vnode *dvp = v->a_dvp;
213 struct vnode **vpp = v->a_vpp;
214 struct componentname *cnp = v->a_cnp;
215 struct vattr *vap = v->a_vap;
217 MPASS(vap->va_type == VREG || vap->va_type == VSOCK);
219 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
223 tmpfs_mknod(struct vop_mknod_args *v)
225 struct vnode *dvp = v->a_dvp;
226 struct vnode **vpp = v->a_vpp;
227 struct componentname *cnp = v->a_cnp;
228 struct vattr *vap = v->a_vap;
230 if (vap->va_type != VBLK && vap->va_type != VCHR &&
231 vap->va_type != VFIFO)
234 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
238 tmpfs_open(struct vop_open_args *v)
240 struct vnode *vp = v->a_vp;
241 int mode = v->a_mode;
244 struct tmpfs_node *node;
246 MPASS(VOP_ISLOCKED(vp));
248 node = VP_TO_TMPFS_NODE(vp);
250 /* The file is still active but all its names have been removed
251 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as
252 * it is about to die. */
253 if (node->tn_links < 1)
256 /* If the file is marked append-only, deny write requests. */
257 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE)
261 /* For regular files, the call below is nop. */
262 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags &
263 OBJ_DEAD) == 0, ("dead object"));
264 vnode_create_vobject(vp, node->tn_size, v->a_td);
267 MPASS(VOP_ISLOCKED(vp));
272 tmpfs_close(struct vop_close_args *v)
274 struct vnode *vp = v->a_vp;
276 /* Update node times. */
283 tmpfs_access(struct vop_access_args *v)
285 struct vnode *vp = v->a_vp;
286 accmode_t accmode = v->a_accmode;
287 struct ucred *cred = v->a_cred;
290 struct tmpfs_node *node;
292 MPASS(VOP_ISLOCKED(vp));
294 node = VP_TO_TMPFS_NODE(vp);
296 switch (vp->v_type) {
302 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) {
322 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) {
327 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid,
328 node->tn_gid, accmode, cred, NULL);
331 MPASS(VOP_ISLOCKED(vp));
337 tmpfs_getattr(struct vop_getattr_args *v)
339 struct vnode *vp = v->a_vp;
340 struct vattr *vap = v->a_vap;
342 struct tmpfs_node *node;
344 node = VP_TO_TMPFS_NODE(vp);
348 vap->va_type = vp->v_type;
349 vap->va_mode = node->tn_mode;
350 vap->va_nlink = node->tn_links;
351 vap->va_uid = node->tn_uid;
352 vap->va_gid = node->tn_gid;
353 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
354 vap->va_fileid = node->tn_id;
355 vap->va_size = node->tn_size;
356 vap->va_blocksize = PAGE_SIZE;
357 vap->va_atime = node->tn_atime;
358 vap->va_mtime = node->tn_mtime;
359 vap->va_ctime = node->tn_ctime;
360 vap->va_birthtime = node->tn_birthtime;
361 vap->va_gen = node->tn_gen;
362 vap->va_flags = node->tn_flags;
363 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ?
364 node->tn_rdev : NODEV;
365 vap->va_bytes = round_page(node->tn_size);
372 tmpfs_setattr(struct vop_setattr_args *v)
374 struct vnode *vp = v->a_vp;
375 struct vattr *vap = v->a_vap;
376 struct ucred *cred = v->a_cred;
377 struct thread *td = curthread;
381 MPASS(VOP_ISLOCKED(vp));
385 /* Abort if any unsettable attribute is given. */
386 if (vap->va_type != VNON ||
387 vap->va_nlink != VNOVAL ||
388 vap->va_fsid != VNOVAL ||
389 vap->va_fileid != VNOVAL ||
390 vap->va_blocksize != VNOVAL ||
391 vap->va_gen != VNOVAL ||
392 vap->va_rdev != VNOVAL ||
393 vap->va_bytes != VNOVAL)
396 if (error == 0 && (vap->va_flags != VNOVAL))
397 error = tmpfs_chflags(vp, vap->va_flags, cred, td);
399 if (error == 0 && (vap->va_size != VNOVAL))
400 error = tmpfs_chsize(vp, vap->va_size, cred, td);
402 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL))
403 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td);
405 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL))
406 error = tmpfs_chmod(vp, vap->va_mode, cred, td);
408 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL &&
409 vap->va_atime.tv_nsec != VNOVAL) ||
410 (vap->va_mtime.tv_sec != VNOVAL &&
411 vap->va_mtime.tv_nsec != VNOVAL) ||
412 (vap->va_birthtime.tv_sec != VNOVAL &&
413 vap->va_birthtime.tv_nsec != VNOVAL)))
414 error = tmpfs_chtimes(vp, vap, cred, td);
416 /* Update the node times. We give preference to the error codes
417 * generated by this function rather than the ones that may arise
418 * from tmpfs_update. */
421 MPASS(VOP_ISLOCKED(vp));
427 tmpfs_read(struct vop_read_args *v)
431 struct tmpfs_node *node;
434 if (vp->v_type != VREG)
437 if (uio->uio_offset < 0)
439 node = VP_TO_TMPFS_NODE(vp);
440 node->tn_status |= TMPFS_NODE_ACCESSED;
441 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio));
445 tmpfs_write(struct vop_write_args *v)
449 struct tmpfs_node *node;
456 ioflag = v->a_ioflag;
458 node = VP_TO_TMPFS_NODE(vp);
459 oldsize = node->tn_size;
461 if (uio->uio_offset < 0 || vp->v_type != VREG)
463 if (uio->uio_resid == 0)
465 if (ioflag & IO_APPEND)
466 uio->uio_offset = node->tn_size;
467 if (uio->uio_offset + uio->uio_resid >
468 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize)
470 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
472 extended = uio->uio_offset + uio->uio_resid > node->tn_size;
474 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid,
480 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio);
481 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
482 (extended ? TMPFS_NODE_CHANGED : 0);
483 if (node->tn_mode & (S_ISUID | S_ISGID)) {
484 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0))
485 node->tn_mode &= ~(S_ISUID | S_ISGID);
488 (void)tmpfs_reg_resize(vp, oldsize, TRUE);
491 MPASS(IMPLIES(error == 0, uio->uio_resid == 0));
492 MPASS(IMPLIES(error != 0, oldsize == node->tn_size));
498 tmpfs_fsync(struct vop_fsync_args *v)
500 struct vnode *vp = v->a_vp;
502 MPASS(VOP_ISLOCKED(vp));
510 tmpfs_remove(struct vop_remove_args *v)
512 struct vnode *dvp = v->a_dvp;
513 struct vnode *vp = v->a_vp;
516 struct tmpfs_dirent *de;
517 struct tmpfs_mount *tmp;
518 struct tmpfs_node *dnode;
519 struct tmpfs_node *node;
521 MPASS(VOP_ISLOCKED(dvp));
522 MPASS(VOP_ISLOCKED(vp));
524 if (vp->v_type == VDIR) {
529 dnode = VP_TO_TMPFS_DIR(dvp);
530 node = VP_TO_TMPFS_NODE(vp);
531 tmp = VFS_TO_TMPFS(vp->v_mount);
532 de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
535 /* Files marked as immutable or append-only cannot be deleted. */
536 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) ||
537 (dnode->tn_flags & APPEND)) {
542 /* Remove the entry from the directory; as it is a file, we do not
543 * have to change the number of hard links of the directory. */
544 tmpfs_dir_detach(dvp, de);
545 if (v->a_cnp->cn_flags & DOWHITEOUT)
546 tmpfs_dir_whiteout_add(dvp, v->a_cnp);
548 /* Free the directory entry we just deleted. Note that the node
549 * referred by it will not be removed until the vnode is really
551 tmpfs_free_dirent(tmp, de);
553 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED;
562 tmpfs_link(struct vop_link_args *v)
564 struct vnode *dvp = v->a_tdvp;
565 struct vnode *vp = v->a_vp;
566 struct componentname *cnp = v->a_cnp;
569 struct tmpfs_dirent *de;
570 struct tmpfs_node *node;
572 MPASS(VOP_ISLOCKED(dvp));
573 MPASS(cnp->cn_flags & HASBUF);
574 MPASS(dvp != vp); /* XXX When can this be false? */
575 node = VP_TO_TMPFS_NODE(vp);
577 /* Ensure that we do not overflow the maximum number of links imposed
579 MPASS(node->tn_links <= LINK_MAX);
580 if (node->tn_links == LINK_MAX) {
585 /* We cannot create links of files marked immutable or append-only. */
586 if (node->tn_flags & (IMMUTABLE | APPEND)) {
591 /* Allocate a new directory entry to represent the node. */
592 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node,
593 cnp->cn_nameptr, cnp->cn_namelen, &de);
597 /* Insert the new directory entry into the appropriate directory. */
598 if (cnp->cn_flags & ISWHITEOUT)
599 tmpfs_dir_whiteout_remove(dvp, cnp);
600 tmpfs_dir_attach(dvp, de);
602 /* vp link count has changed, so update node times. */
603 node->tn_status |= TMPFS_NODE_CHANGED;
613 * We acquire all but fdvp locks using non-blocking acquisitions. If we
614 * fail to acquire any lock in the path we will drop all held locks,
615 * acquire the new lock in a blocking fashion, and then release it and
616 * restart the rename. This acquire/release step ensures that we do not
617 * spin on a lock waiting for release. On error release all vnode locks
618 * and decrement references the way tmpfs_rename() would do.
621 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp,
622 struct vnode *tdvp, struct vnode **tvpp,
623 struct componentname *fcnp, struct componentname *tcnp)
627 struct tmpfs_dirent *de;
628 int error, restarts = 0;
631 if (*tvpp != NULL && *tvpp != tdvp)
632 VOP_UNLOCK(*tvpp, 0);
637 error = vn_lock(fdvp, LK_EXCLUSIVE);
640 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
642 error = vn_lock(tdvp, LK_EXCLUSIVE);
649 * Re-resolve fvp to be certain it still exists and fetch the
652 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp);
656 if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
657 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
663 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp);
669 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp);
674 * Concurrent rename race.
687 VOP_UNLOCK(*fvpp, 0);
689 * Re-resolve tvp and acquire the vnode lock if present.
691 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp);
693 * If tvp disappeared we just carry on.
695 if (de == NULL && *tvpp != NULL) {
700 * Get the tvp ino if the lookup succeeded. We may have to restart
701 * if the non-blocking acquire fails.
705 error = tmpfs_alloc_vp(mp, de->td_node,
706 LK_EXCLUSIVE | LK_NOWAIT, &nvp);
715 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE,
721 * fdvp contains fvp, thus tvp (=fdvp) is not empty.
730 tmpfs_rename_restarts += restarts;
740 tmpfs_rename_restarts += restarts;
746 tmpfs_rename(struct vop_rename_args *v)
748 struct vnode *fdvp = v->a_fdvp;
749 struct vnode *fvp = v->a_fvp;
750 struct componentname *fcnp = v->a_fcnp;
751 struct vnode *tdvp = v->a_tdvp;
752 struct vnode *tvp = v->a_tvp;
753 struct componentname *tcnp = v->a_tcnp;
754 struct mount *mp = NULL;
758 struct tmpfs_dirent *de;
759 struct tmpfs_mount *tmp;
760 struct tmpfs_node *fdnode;
761 struct tmpfs_node *fnode;
762 struct tmpfs_node *tnode;
763 struct tmpfs_node *tdnode;
765 MPASS(VOP_ISLOCKED(tdvp));
766 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp)));
767 MPASS(fcnp->cn_flags & HASBUF);
768 MPASS(tcnp->cn_flags & HASBUF);
770 /* Disallow cross-device renames.
771 * XXX Why isn't this done by the caller? */
772 if (fvp->v_mount != tdvp->v_mount ||
773 (tvp != NULL && fvp->v_mount != tvp->v_mount)) {
778 /* If source and target are the same file, there is nothing to do. */
784 /* If we need to move the directory between entries, lock the
785 * source so that we can safely operate on it. */
786 if (fdvp != tdvp && fdvp != tvp) {
787 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
789 error = vfs_busy(mp, 0);
794 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp,
800 ASSERT_VOP_ELOCKED(fdvp,
801 "tmpfs_rename: fdvp not locked");
802 ASSERT_VOP_ELOCKED(tdvp,
803 "tmpfs_rename: tdvp not locked");
805 ASSERT_VOP_ELOCKED(tvp,
806 "tmpfs_rename: tvp not locked");
814 tmp = VFS_TO_TMPFS(tdvp->v_mount);
815 tdnode = VP_TO_TMPFS_DIR(tdvp);
816 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp);
817 fdnode = VP_TO_TMPFS_DIR(fdvp);
818 fnode = VP_TO_TMPFS_NODE(fvp);
819 de = tmpfs_dir_lookup(fdnode, fnode, fcnp);
821 /* Entry can disappear before we lock fdvp,
822 * also avoid manipulating '.' and '..' entries. */
824 if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
825 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
831 MPASS(de->td_node == fnode);
833 /* If re-naming a directory to another preexisting directory
834 * ensure that the target directory is empty so that its
835 * removal causes no side effects.
836 * Kern_rename gurantees the destination to be a directory
837 * if the source is one. */
839 MPASS(tnode != NULL);
841 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
842 (tdnode->tn_flags & (APPEND | IMMUTABLE))) {
847 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) {
848 if (tnode->tn_size > 0) {
852 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) {
855 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) {
859 MPASS(fnode->tn_type != VDIR &&
860 tnode->tn_type != VDIR);
864 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))
865 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) {
870 /* Ensure that we have enough memory to hold the new name, if it
871 * has to be changed. */
872 if (fcnp->cn_namelen != tcnp->cn_namelen ||
873 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) {
874 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK);
878 /* If the node is being moved to another directory, we have to do
880 if (fdnode != tdnode) {
881 /* In case we are moving a directory, we have to adjust its
882 * parent to point to the new parent. */
883 if (de->td_node->tn_type == VDIR) {
884 struct tmpfs_node *n;
886 /* Ensure the target directory is not a child of the
887 * directory being moved. Otherwise, we'd end up
888 * with stale nodes. */
890 /* TMPFS_LOCK garanties that no nodes are freed while
891 * traversing the list. Nodes can only be marked as
892 * removed: tn_parent == NULL. */
895 while (n != n->tn_dir.tn_parent) {
896 struct tmpfs_node *parent;
899 TMPFS_NODE_UNLOCK(n);
903 free(newname, M_TMPFSNAME);
906 parent = n->tn_dir.tn_parent;
907 TMPFS_NODE_UNLOCK(n);
908 if (parent == NULL) {
912 TMPFS_NODE_LOCK(parent);
913 if (parent->tn_dir.tn_parent == NULL) {
914 TMPFS_NODE_UNLOCK(parent);
924 free(newname, M_TMPFSNAME);
927 TMPFS_NODE_UNLOCK(n);
929 /* Adjust the parent pointer. */
930 TMPFS_VALIDATE_DIR(fnode);
931 TMPFS_NODE_LOCK(de->td_node);
932 de->td_node->tn_dir.tn_parent = tdnode;
933 TMPFS_NODE_UNLOCK(de->td_node);
935 /* As a result of changing the target of the '..'
936 * entry, the link count of the source and target
937 * directories has to be adjusted. */
938 TMPFS_NODE_LOCK(tdnode);
939 TMPFS_ASSERT_LOCKED(tdnode);
941 TMPFS_NODE_UNLOCK(tdnode);
943 TMPFS_NODE_LOCK(fdnode);
944 TMPFS_ASSERT_LOCKED(fdnode);
946 TMPFS_NODE_UNLOCK(fdnode);
950 /* Do the move: just remove the entry from the source directory
951 * and insert it into the target one. */
952 tmpfs_dir_detach(fdvp, de);
954 if (fcnp->cn_flags & DOWHITEOUT)
955 tmpfs_dir_whiteout_add(fdvp, fcnp);
956 if (tcnp->cn_flags & ISWHITEOUT)
957 tmpfs_dir_whiteout_remove(tdvp, tcnp);
959 /* If the name has changed, we need to make it effective by changing
960 * it in the directory entry. */
961 if (newname != NULL) {
962 MPASS(tcnp->cn_namelen <= MAXNAMLEN);
964 free(de->ud.td_name, M_TMPFSNAME);
965 de->ud.td_name = newname;
966 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen);
968 fnode->tn_status |= TMPFS_NODE_CHANGED;
969 tdnode->tn_status |= TMPFS_NODE_MODIFIED;
972 /* If we are overwriting an entry, we have to remove the old one
973 * from the target directory. */
975 struct tmpfs_dirent *tde;
977 /* Remove the old entry from the target directory. */
978 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp);
979 tmpfs_dir_detach(tdvp, tde);
981 /* Free the directory entry we just deleted. Note that the
982 * node referred by it will not be removed until the vnode is
983 * really reclaimed. */
984 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde);
987 tmpfs_dir_attach(tdvp, de);
992 cache_purge_negative(tdvp);
997 if (fdvp != tdvp && fdvp != tvp)
1001 /* Release target nodes. */
1002 /* XXX: I don't understand when tdvp can be the same as tvp, but
1003 * other code takes care of this... */
1011 /* Release source nodes. */
1022 tmpfs_mkdir(struct vop_mkdir_args *v)
1024 struct vnode *dvp = v->a_dvp;
1025 struct vnode **vpp = v->a_vpp;
1026 struct componentname *cnp = v->a_cnp;
1027 struct vattr *vap = v->a_vap;
1029 MPASS(vap->va_type == VDIR);
1031 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
1035 tmpfs_rmdir(struct vop_rmdir_args *v)
1037 struct vnode *dvp = v->a_dvp;
1038 struct vnode *vp = v->a_vp;
1041 struct tmpfs_dirent *de;
1042 struct tmpfs_mount *tmp;
1043 struct tmpfs_node *dnode;
1044 struct tmpfs_node *node;
1046 MPASS(VOP_ISLOCKED(dvp));
1047 MPASS(VOP_ISLOCKED(vp));
1049 tmp = VFS_TO_TMPFS(dvp->v_mount);
1050 dnode = VP_TO_TMPFS_DIR(dvp);
1051 node = VP_TO_TMPFS_DIR(vp);
1053 /* Directories with more than two entries ('.' and '..') cannot be
1055 if (node->tn_size > 0) {
1060 if ((dnode->tn_flags & APPEND)
1061 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1066 /* This invariant holds only if we are not trying to remove "..".
1067 * We checked for that above so this is safe now. */
1068 MPASS(node->tn_dir.tn_parent == dnode);
1070 /* Get the directory entry associated with node (vp). This was
1071 * filled by tmpfs_lookup while looking up the entry. */
1072 de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
1073 MPASS(TMPFS_DIRENT_MATCHES(de,
1074 v->a_cnp->cn_nameptr,
1075 v->a_cnp->cn_namelen));
1077 /* Check flags to see if we are allowed to remove the directory. */
1078 if (dnode->tn_flags & APPEND
1079 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) {
1085 /* Detach the directory entry from the directory (dnode). */
1086 tmpfs_dir_detach(dvp, de);
1087 if (v->a_cnp->cn_flags & DOWHITEOUT)
1088 tmpfs_dir_whiteout_add(dvp, v->a_cnp);
1090 /* No vnode should be allocated for this entry from this point */
1091 TMPFS_NODE_LOCK(node);
1092 TMPFS_ASSERT_ELOCKED(node);
1094 node->tn_dir.tn_parent = NULL;
1095 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
1096 TMPFS_NODE_MODIFIED;
1098 TMPFS_NODE_UNLOCK(node);
1100 TMPFS_NODE_LOCK(dnode);
1101 TMPFS_ASSERT_ELOCKED(dnode);
1103 dnode->tn_status |= TMPFS_NODE_ACCESSED | \
1104 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
1105 TMPFS_NODE_UNLOCK(dnode);
1110 /* Free the directory entry we just deleted. Note that the node
1111 * referred by it will not be removed until the vnode is really
1113 tmpfs_free_dirent(tmp, de);
1115 /* Release the deleted vnode (will destroy the node, notify
1116 * interested parties and clean it from the cache). */
1118 dnode->tn_status |= TMPFS_NODE_CHANGED;
1128 tmpfs_symlink(struct vop_symlink_args *v)
1130 struct vnode *dvp = v->a_dvp;
1131 struct vnode **vpp = v->a_vpp;
1132 struct componentname *cnp = v->a_cnp;
1133 struct vattr *vap = v->a_vap;
1134 char *target = v->a_target;
1136 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */
1137 MPASS(vap->va_type == VLNK);
1139 vap->va_type = VLNK;
1142 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target);
1146 tmpfs_readdir(struct vop_readdir_args *v)
1148 struct vnode *vp = v->a_vp;
1149 struct uio *uio = v->a_uio;
1150 int *eofflag = v->a_eofflag;
1151 u_long **cookies = v->a_cookies;
1152 int *ncookies = v->a_ncookies;
1157 struct tmpfs_node *node;
1159 /* This operation only makes sense on directory nodes. */
1160 if (vp->v_type != VDIR)
1164 node = VP_TO_TMPFS_DIR(vp);
1166 startresid = uio->uio_resid;
1168 /* Allocate cookies for NFS and compat modules. */
1169 if (cookies != NULL && ncookies != NULL) {
1170 maxcookies = howmany(node->tn_size,
1171 sizeof(struct tmpfs_dirent)) + 2;
1172 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP,
1177 if (cookies == NULL)
1178 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL);
1180 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies,
1183 /* Buffer was filled without hitting EOF. */
1184 if (error == EJUSTRETURN)
1185 error = (uio->uio_resid != startresid) ? 0 : EINVAL;
1187 if (error != 0 && cookies != NULL)
1188 free(*cookies, M_TEMP);
1190 if (eofflag != NULL)
1192 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
1198 tmpfs_readlink(struct vop_readlink_args *v)
1200 struct vnode *vp = v->a_vp;
1201 struct uio *uio = v->a_uio;
1204 struct tmpfs_node *node;
1206 MPASS(uio->uio_offset == 0);
1207 MPASS(vp->v_type == VLNK);
1209 node = VP_TO_TMPFS_NODE(vp);
1211 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid),
1213 node->tn_status |= TMPFS_NODE_ACCESSED;
1219 tmpfs_inactive(struct vop_inactive_args *v)
1221 struct vnode *vp = v->a_vp;
1223 struct tmpfs_node *node;
1225 node = VP_TO_TMPFS_NODE(vp);
1227 if (node->tn_links == 0)
1234 tmpfs_reclaim(struct vop_reclaim_args *v)
1236 struct vnode *vp = v->a_vp;
1238 struct tmpfs_mount *tmp;
1239 struct tmpfs_node *node;
1241 node = VP_TO_TMPFS_NODE(vp);
1242 tmp = VFS_TO_TMPFS(vp->v_mount);
1244 if (vp->v_type == VREG)
1245 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj);
1247 vnode_destroy_vobject(vp);
1248 vp->v_object = NULL;
1251 TMPFS_NODE_LOCK(node);
1252 TMPFS_ASSERT_ELOCKED(node);
1255 /* If the node referenced by this vnode was deleted by the user,
1256 * we must free its associated data structures (now that the vnode
1257 * is being reclaimed). */
1258 if (node->tn_links == 0 &&
1259 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) {
1260 node->tn_vpstate = TMPFS_VNODE_DOOMED;
1261 TMPFS_NODE_UNLOCK(node);
1262 tmpfs_free_node(tmp, node);
1264 TMPFS_NODE_UNLOCK(node);
1266 MPASS(vp->v_data == NULL);
1271 tmpfs_print(struct vop_print_args *v)
1273 struct vnode *vp = v->a_vp;
1275 struct tmpfs_node *node;
1277 node = VP_TO_TMPFS_NODE(vp);
1279 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n",
1280 node, node->tn_flags, node->tn_links);
1281 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n",
1282 node->tn_mode, node->tn_uid, node->tn_gid,
1283 (intmax_t)node->tn_size, node->tn_status);
1285 if (vp->v_type == VFIFO)
1294 tmpfs_pathconf(struct vop_pathconf_args *v)
1296 int name = v->a_name;
1297 register_t *retval = v->a_retval;
1320 case _PC_CHOWN_RESTRICTED:
1332 case _PC_FILESIZEBITS:
1333 *retval = 0; /* XXX Don't know which value should I return. */
1344 tmpfs_vptofh(struct vop_vptofh_args *ap)
1346 struct tmpfs_fid *tfhp;
1347 struct tmpfs_node *node;
1349 tfhp = (struct tmpfs_fid *)ap->a_fhp;
1350 node = VP_TO_TMPFS_NODE(ap->a_vp);
1352 tfhp->tf_len = sizeof(struct tmpfs_fid);
1353 tfhp->tf_id = node->tn_id;
1354 tfhp->tf_gen = node->tn_gen;
1360 tmpfs_whiteout(struct vop_whiteout_args *ap)
1362 struct vnode *dvp = ap->a_dvp;
1363 struct componentname *cnp = ap->a_cnp;
1364 struct tmpfs_dirent *de;
1366 switch (ap->a_flags) {
1370 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp);
1372 return (de->td_node == NULL ? 0 : EEXIST);
1373 return (tmpfs_dir_whiteout_add(dvp, cnp));
1375 tmpfs_dir_whiteout_remove(dvp, cnp);
1378 panic("tmpfs_whiteout: unknown op");
1383 * vnode operations vector used for files stored in a tmpfs file system.
1385 struct vop_vector tmpfs_vnodeop_entries = {
1386 .vop_default = &default_vnodeops,
1387 .vop_lookup = vfs_cache_lookup,
1388 .vop_cachedlookup = tmpfs_lookup,
1389 .vop_create = tmpfs_create,
1390 .vop_mknod = tmpfs_mknod,
1391 .vop_open = tmpfs_open,
1392 .vop_close = tmpfs_close,
1393 .vop_access = tmpfs_access,
1394 .vop_getattr = tmpfs_getattr,
1395 .vop_setattr = tmpfs_setattr,
1396 .vop_read = tmpfs_read,
1397 .vop_write = tmpfs_write,
1398 .vop_fsync = tmpfs_fsync,
1399 .vop_remove = tmpfs_remove,
1400 .vop_link = tmpfs_link,
1401 .vop_rename = tmpfs_rename,
1402 .vop_mkdir = tmpfs_mkdir,
1403 .vop_rmdir = tmpfs_rmdir,
1404 .vop_symlink = tmpfs_symlink,
1405 .vop_readdir = tmpfs_readdir,
1406 .vop_readlink = tmpfs_readlink,
1407 .vop_inactive = tmpfs_inactive,
1408 .vop_reclaim = tmpfs_reclaim,
1409 .vop_print = tmpfs_print,
1410 .vop_pathconf = tmpfs_pathconf,
1411 .vop_vptofh = tmpfs_vptofh,
1412 .vop_whiteout = tmpfs_whiteout,
1413 .vop_bmap = VOP_EOPNOTSUPP,